package com.bdqn.demo.service;

import com.bdqn.demo.pojo.SysUser;
import com.bdqn.demo.repository.UserRepository;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Service("userService")
public class UserServiceImpl implements UserService {
    @Resource
    private UserRepository repository;

    @Override
    public Page<SysUser> findPageByMap(Map param, Pageable pageable) {
        return repository.findAll(new Specification<SysUser>(){
            @Override
            public Predicate toPredicate(Root<SysUser> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
                List<Predicate> predicates = new ArrayList<>();
                if (param.get("usrName") != null) { //动态SQL
                    predicates.add(cb.like(root.get("usrName"), "%" + param.get("usrName") + "%"));
                }
                if (param.get("usrRoleId") != null) {
                    predicates.add(cb.equal(root.get("usrRoleId"), param.get("usrRoleId")));
                }
                return cb.and(predicates.toArray(new Predicate[predicates.size(
                )]));
            }
        },pageable);
    }
}
